What is StringUtils.firstNonBlank in Java?
firstNonBlank is a static method of the StringUtils class that returns the first element in the given list of elements that is not empty, null, or whitespace only. If all the elements are blank or the list is null or empty, null is returned.
A character is classified as whitespace using Character. isWhitespace.
How to import StringUtils
StringUtils is defined in the Apache Commons Lang package. Apache Commons Lang can be added to the Maven project by adding the following dependency to the pom.xml file.
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
Note: For other versions of the
commons-langpackage, refer to the Maven Repository.
You can import the StringUtils class as follows:
import org.apache.commons.lang3.StringUtils;
Syntax
public static <T extends CharSequence> T firstNonBlank(final T... values)
Parameters
final T... values: the list of values to test
To understand what
...is, refer to this shot.
Return value
The function returns the first non-blank value.
Code
import org.apache.commons.lang3.StringUtils;public class Main {public static void main(String[] args) {String[] strings = {null, "", "educative"};System.out.println("First Non-Blank for the strings - " + StringUtils.firstNonBlank(strings));strings = new String[]{null, "", " ", "educative.io", null, " "};System.out.println("First Non-Blank for the strings - " + StringUtils.firstNonBlank(strings));}}
Explanation
- string list =
[null, "", "educative"]
The output of the method for the string list above is educative, i.e., the first string that is not empty, null, or whitespace only.
- string list =
[null, "", " ", "educative.io", null, " "]
The output of the method for the string list above is educative.io, i.e., the first string that is not empty, null, or whitespace only.
Expected output
First Non-Blank for the strings - educative
First Non-Blank for the strings - educative.io